Minera Yanacocha S.R.L. (Yanacocha), the JV between US-based Newmont Mining and local mining company Buenaventura, is a Peruvian mining company incorporated in 1992, with mining operations in the Cajamarca district. Its flagship project is the Minas Congas gold-copper operation. Newmont suspended construction at Conga in 2011 due to violent protests over water use. Since then, Minera Yanacocha has been working on reservoir projects at the site to quadruple the local water supply. Conga is one of the biggest investment projects in Peru's mining portfolio. Average output over the first five years has been estimated at 650,000-750,000oz/y of gold and 160M-210Mlb/y of copper. The company is considering developing the troubled project along with neighboring deposits, like Michiquillay or Galeno.